Polarization-Splitting Grating Coupler on Lithium Niobate Thin Film

被引:0
|
作者
Chen, Zhihua [1 ,2 ]
Chen, Longxi [1 ,2 ]
Meng, Xiangjia [1 ,2 ]
Ning, Yufu [1 ,2 ]
Xun, Yang [1 ]
机构
[1] Shandong Youth Univ Polit Sci, Sch Informat Engn, Jinan 250103, Peoples R China
[2] Univ Shandong, New Technol Res & Dev Ctr Intelligent Informat Con, Jinan 250103, Peoples R China
关键词
polarization splitter; grating coupler; lithium niobate; LNOI; WAVE-GUIDES; SILICON; DESIGN;
D O I
10.3390/cryst14030226
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
In this study, one-dimensional grating coupler on single-crystal lithium niobate thin film (lithium niobate on insulator, LNOI) that also served as a polarization splitter was designed. The coupler could separate both orthogonal polarization states into two opposite directions while coupled light from a standard single-mode fiber to a waveguide on LNOI at the same time. Using segmented and apodized designing, the peak coupling efficiencies (CEs) around telecommunication wavelength 1550 nm for fundamental TE and TM modes of -2.82 dB and -2.83 dB, respectively, were achieved. The CEs could be optimized to -1.97 dB and -1.8 dB when a metal layer was added below the silicon dioxide layer.
引用
收藏
页数:12
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